TY - JOUR
T1 - Enhancement of the gas barrier property of polymers by DLC coating with organosilane interlayer
AU - Tashiro, Hiroki
AU - Nakaya, Masaki
AU - Hotta, Atsushi
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for the Global Center of Excellence Program for the “Center for Education and Research of Symbiotic, Safe and Secure System Design” from the Ministry of Education, Culture, Sport, and Technology in Japan (A.H.) , a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science (JSPS: “KAKENHI”) (No. 23360294 to A.H.), a Grant-in-Aid for Scientific Research (S) (No. 21226006 to A.H.), and a Grant-in-Aid for Scientific Research for Challenging Exploratory Research (No. 24656395 to A.H.). We are deeply grateful to Prof. Tetsuya Suzuki in Keio University for the CVD equipment.
PY - 2013
Y1 - 2013
N2 - A new surface modification method by DLC coating with organosilane interlayer was introduced. Some DLC-coated polypropylene (PP) films pretreated with certain types of organosilane interlayers showed marked improvement in the gas barrier property. Among the DLC-coated PP, the PP films modified by organosilane interlayers with an amino group presented an extremely low oxygen transmission rate, which was even comparable to the existing low oxygen transmission rate of commercial DLC-coated PET with very high gas-barrier property. The barrier improvement factor (BIF) of DLC-coated PP by the amino-organosilane interlayer became approximately 300 times higher than that of the untreated neat PP. By observing the DLC surface, it was considered that such gas barrier improvement occurred due to the establishment of flawless DLC on PP with few cracks. In addition, DLC which was deposited onto the organosilane interlayer showed higher sp3/sp2 ratio than an ordinary DLC, indicating a fairly dense DLC structure synthesized on PP with the organosilane interlayer, which was revealed by XPS. Furthermore, the new surface-treatment method for DLC was extensively found to be applicable to several other types of polymers including polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS), and polylactide (PLA) which are all important polymeric materials for industry.
AB - A new surface modification method by DLC coating with organosilane interlayer was introduced. Some DLC-coated polypropylene (PP) films pretreated with certain types of organosilane interlayers showed marked improvement in the gas barrier property. Among the DLC-coated PP, the PP films modified by organosilane interlayers with an amino group presented an extremely low oxygen transmission rate, which was even comparable to the existing low oxygen transmission rate of commercial DLC-coated PET with very high gas-barrier property. The barrier improvement factor (BIF) of DLC-coated PP by the amino-organosilane interlayer became approximately 300 times higher than that of the untreated neat PP. By observing the DLC surface, it was considered that such gas barrier improvement occurred due to the establishment of flawless DLC on PP with few cracks. In addition, DLC which was deposited onto the organosilane interlayer showed higher sp3/sp2 ratio than an ordinary DLC, indicating a fairly dense DLC structure synthesized on PP with the organosilane interlayer, which was revealed by XPS. Furthermore, the new surface-treatment method for DLC was extensively found to be applicable to several other types of polymers including polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS), and polylactide (PLA) which are all important polymeric materials for industry.
KW - DLC
KW - Gas barrier
KW - Organosilane interlayer
KW - Polymer
KW - Surface treatment
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U2 - 10.1016/j.diamond.2013.03.001
DO - 10.1016/j.diamond.2013.03.001
M3 - Article
AN - SCOPUS:84875871213
SN - 0925-9635
VL - 35
SP - 7
EP - 13
JO - Diamond and Related Materials
JF - Diamond and Related Materials
ER -